Card: note that deadline_status is fixed at build time

README.md

@@ -39,4 +39,10 @@ The downloaded source inputs and `build/source-manifest.json` are local build in
 
 `data/offers.jsonl` is the line-oriented index. `data/offers.json` is the browser-ready equivalent. `data/coverage.json` describes the exact build scope and counts. Each row links to the original report and notice, and records the notice hash and access time.
 
+`deadline_status` was set once, at the build time recorded in `data/coverage.json` (2026-07-30). It is not recomputed. Before relying on a row marked `open`, compare its `enrollment_deadline` with today's date. On 2026-09-27, 8 of the 20 rows marked `open` had a deadline that had already passed; the latest deadline among them is 2026-10-31. To count them for today's date:
+
+```sh
+python -c "import json,datetime; t=str(datetime.date.today()); rows=[json.loads(l) for l in open('data/offers.jsonl')]; print(sum(r['deadline_status']=='open' and r['enrollment_deadline']<t for r in rows), 'of', sum(r['deadline_status']=='open' for r in rows))"
+```
+
 The software is MIT-licensed. CyberNative AI LLC dedicates only its rights, if any, in the selection and arrangement of `data/` under CC0 1.0 Universal; linked or underlying notices, notice prose, third-party trademarks, and other third-party material are excluded. [DATASET.md](DATASET.md) governs the exact scope.